Marathon training has little or no effect on most people's weight, scientists say.
Many long-distance runners find that even when they are running more than 50 miles in a week their waistlines barely get smaller, with some actually gaining weight.
According to Harvard University's lifestyle and nutrition researcher, Mary Kennedy, it is a particular problem for women.
'I don't mean this in any derogatory way, but marathoning has really become accessible for everyone, which is amazing and wonderful,' she told the New York Magazine.
'But just because you cross the finish line doesn't mean you were running at a really vigorous pace seven days a week.
'You're so focused on going far, so you're not necessarily doing a vigorous run.'
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